Interesting this with pistons that you call 95 P 30, I got information from an old racing colleague a bit for my time!
Mahle and Wahl made 1974-75 pistons that were 98mm with the marking 95 P30 and were used in the RSR engines of the larger race teams (until Porsche stopped them). They had 22mm piston bolts as I have on mine! so here probably I can find the correct piston rings 1,5x,1,5x,4,0 mm
So it was a bit of cheating from some racing teams on the RSR 74-75 cars back then!
https://wahl-spezialkolben.de/en/